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z80tonops

The aim of z80nops, is to compute the amount of nops takes a (very) simple z80 routine. There are lots of limitations to this project:

  • does not take into account insttructions having 2 durations (a conditionnal jump, for example)
  • does not take into account instructions whose durations depends on a specific register (ldir for example)
  • does not take into account branching possibilities and sub-functions (no tree of duration are computed)

However, these limitations could be removed if necessary

Compilation

git clone https://github.com/cpcsdk/z80tonops.git
mkdir build && cd build
cmake ../z80tonops/src
make && sudo make install

Usage

No argument

The purpose of this mode is to integrate well with editors.

echo " 
 ld bc, 0xbc00 + 2
 out (c), c
 inc b
 ld hl, XXX
 out (c), h
 dec b
 inc c
 out (c), c
 inc b
 out (c), l " | z80tonops

which outputs

; START COUNTING

 ld bc, 0xbc00 + 2  ; 3 nops
 out (c), c  ; 4 nops
 inc b  ; 1 nops
 ld hl, XXX  ; 3 nops
 out (c), h  ; 4 nops
 dec b  ; 1 nops
 inc c  ; 1 nops
 out (c), c  ; 4 nops
 inc b  ; 1 nops
 out (c), l   ; 4 nops
; STOP COUNTING
; Total number of nops = 26

Input file argument

z80tonops test.z80

which outputs

; START COUNTING
 ld bc, 0xbc00 + 2  ; 3 nops
 out (c), c  ; 4 nops
 inc b  ; 1 nops
 ld hl, XXX  ; 3 nops
 out (c), h  ; 4 nops
 dec b  ; 1 nops
 inc c  ; 1 nops
 out (c), c  ; 4 nops
 inc b  ; 1 nops
 out (c), l   ; 4 nops
; STOP COUNTING
; Total number of nops = 26

From vim

In visual mode, selection of the code of interest. Then [ESC]:!z80tonops to replace the lines by a version appended with the number of nops

TODO

  • Tackle the limitations
  • Better integration with vim (Add/remove nops annoations, compare manually annotated nops with computed ones, ...)